body,html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 80%;
    font-size: 1.2em
}

.main {
    width: 90%;
    height: 80%;
    margin: 30px auto
}

.main p {
    margin-bottom: 15px;
    margin-top: 15px
}

.main input {
    width: 120px;
    height: 40px;
    font-size: .8em
}

#formula {
    width: 250px
}
